A scoped C++ namespace symbol

D supports the following syntax to declare symbol(s) as being part of a C++ namespace:

extern (C++,"myNamespace") {/+ Symbols +/ }// String variantextern (C++, SomeNamespace) {/+ Other symbols +/ }// Identifier variant

The first form is an attribute and only affects mangling, and is implemented indmd.attrib. The second form introduces a named scope and allows symbols to be refered to with or without the namespace name, much like a named template mixin, and is implemented in this module.

extern (C++, Basket){struct StrawBerry;void swapFood (Strawberry* f1, Strawberry* f2);}void main (){    Basket.StrawBerry fruit1;    StrawBerry fruit2;    Basket.swapFood(fruit1, fruit2);    swapFood(fruit1, fruit2);}

Hence theNspace symbol implements the usualScopeDsymbol semantics. Note that it impliesextern(C++) so it cannot be used as a generic named scope. Additionally,Nspace with the sameIdentifier can be defined in different module (as C++ allows a namespace to be spread accross translation units), but symbols in it should be considered part of the same scope. Lastly, not all possible C++ namespace names are valid D identifier.

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